What makes one car "cooler" than another—especially in NASCAR? It's not like sports car racing, where 10 to 15 different car models take to the track in any given race. These days, NASCAR racing features only Fords, Chevrolets and Toyotas with the occasional independent Dodge/RAM straggler potentially hanging around in the Nationwide or Camping World Truck Series. Compare that to the early 1990s, when every General Motors brand seemed to have an entry. On one hand, with NASCAR moving to cars that better resemble their street counterparts, just about every new model looks pretty good. But a new batch of paint schemes separate some of next year's challengers from the rest. With that in mind, this list is a mixed bag. In some cases, pain...